From: mru@kth.se (Måns Rullgård)
To: linux-kernel@vger.kernel.org
Subject: Re: Selecting CPU frequency on Asus P4M laptop
Date: Thu, 27 Nov 2003 18:48:59 +0100 [thread overview]
Message-ID: <yw1xhe0pln1w.fsf@kth.se> (raw)
In-Reply-To: yw1x65h5ddbn.fsf@kth.se
mru@kth.se (Måns Rullgård) writes:
> I have an Asus M2E laptop with a 1.8 GHz P4M CPU. Using the 'acpi'
> cpufreq driver, I can select between 1.8 GHz and 1.2 GHz, thereby
> changing the power consumption. If I boot the machine with the AC
> adapter disconnected, it starts off at 1.2 GHz. After that, I can
> lower it to 800 MHz using cpufreq. In short, cpufreq will be able to
> choose among one of two pairs of frequencies, which depend on the
> status of the AC adapter at boot time.
>
> Is there any way to change which of these will be used after booting?
Update:
I ran a speed test, "openssl speed", in the various modes, and it gave
the same results whichever way the machine was booted. It appears to
be reporting/detecting incorrect values when the AC adapter is
unplugged. Switching speeds with cpufreq does change the actual speed
of the CPU.
--
Måns Rullgård
mru@kth.se
prev parent reply other threads:[~2003-11-27 17:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-27 15:46 Selecting CPU frequency on Asus P4M laptop Måns Rullgård
2003-11-27 16:11 ` Marco Roeland
2003-11-27 16:35 ` Måns Rullgård
2003-11-27 17:48 ` Måns Rullgård [this message]
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